| 摘要 |
PCT No. PCT/JP85/00536 Sec. 371 Date Apr. 23, 1986 Sec. 102(e) Date Apr. 23, 1986 PCT Filed Sep. 26, 1985 PCT Pub. No. WO86/02484 PCT Pub. Date Apr. 24, 1986.An electromagnetic actuator according to the present invention comprises (a) a casing mainly consisting of a stationary iron core (1) or a combination of a stationary iron core (1) and a yoke, (1b), the casing being formed with at least one of opening; (b) one or a pair of movable iron core (2) as an actuating member, capable of reciprocally moving through the opening of the casing; (c) an electric winding element (4) arranged in the casing for applying a first magnetomotive force to the movable iron core (2) when an electric current is flowed through the winding element (4); (d) a permanent magnet (5) being so arranged in the casing as to apply the second magnetomotive force to the movable iron core; and (e) a bias force generating means (3) for applying a mechanical force or the first magnetomotive force to the movable iron core (2), wherein the improvement is characterized that a permanent magnet (5) is so arranged in the casing as to apply the second magnetomotive force in parallel to the first magnetomotive force to the movable iron core. The electromagnetic actuator can be operated by a fine current, generate large thrust and be used in a electromagnetic valve, or the like. |
